The .3800" dimension is a 'reference'. There is no tolerance specified other than note about Body Diameter - 0.007".
The .3800" also must be a MAX number because the chamber is spec'd at 0.3810" and there must be some clearance or the slightest puff of smoke will keep a round from chambering.
The .3810" dimension is also a 'reference'. If it has a tolerance, it is +0.004".
Notice that the 0.3800" and 0.3810" are specified to the nearest ten thousandth of an inch. The spec if very serious about these numbers to have spec'd them to 4 decimal places.
"No matter how cynical you become, it's never enough to keep up." - Lily Tomlin